The fluid flow in tundish is a non-isothermal process and the temperature variation of stream from teeming ladle dominates the fluid flow and thermal distribution in tundish. A numerical model was established to investigate the effect of inlet cooling rate on fluid flow and temperature distribution in tundish based on a FTSC （Flexible Thin Slab Casting） tundish. The inlet cooling rate varies from 0. 5 to 0. 25 ~C/rain. Under the present calculation conditions, the following conclusions were made. When the stream temperature from teeming ladle drops seriously （for inlet cooling rate of 0.5℃/min）, there is a ＂backward flow＂ at the coming end of casting. The horizontal flow along the free surface turns to flow along the bottom of tundish. The bottom flow shortens the fluid flow route in tundish and deteriorates the removal effect of nonmetallic inclusions from molten steel. Nevertheless, when the inlet cooling rate decreases to 0.25℃/min, the horizontal flow is sustained during the whole casting period. The present research provides theoretical directions for temperature control in teeming ladle and continuous casting tundish during production of advanced steels.
参考文献
| [1] | Yogeshwar SAHAI;Toshihiko EMI .Melt Flow Characterization in Continuous Casting Tundishes[J].ISIJ International,1996(6):667-672. |
| [2] | R.D. MORALES;S. LOPEZ-RAMIREZ;J. PALAFOX-RAMOS .Numerical and Modeling Analysis of Fluid Flow and Heat Transfer of Liquid Steel in a Tundish with Different Flow Control Devices[J].ISIJ International,1999(5):455-462. |
| [3] | Koria S C;Singh S .Physical Modeling of the Effects of the Flow Modifier on the Dynamics of Molten Steel Flowing in a Tundish[J].ISIJ International,1994,34(10):784. |
| [4] | Rodolfo D. Morales;Manuela Diaz-Cruz .Modelling steel flow in a three-strand billet tundish using a turbulence inhibitor[J].Steel Research,2001(1):11-16. |
| [5] | R.D.Morales;S.Lopez-Ramirez;J.Palafox-Ramos .Mathematical simulation of effects of flow control devices and buoyancy forces on molten steel flow and evolution of output temperatures in tundish[J].Ironmaking & Steelmaking: Products and applications,2001(1):33-43. |
| [6] | Bolling R;Odenthal H J;Pfeifer H .Transient Fluid Flow in a i Continuous Casting Tundish During Ladle Change and Steady- State Casting[J].Steel Research International,2005,76(01):71. |
| [7] | Mazumdar D;Guthrie R I L .The Physical and Mathematical Modelling of Continuous Casting Tundish Systems[J].ISIJ In- ternational,1999,39(06):524. |
| [8] | S. Singh;S. C. Koria .Tundish steel melt dynamics with and without flow modifiers through physical modelling[J].Ironmaking & Steelmaking: Products and applications,1996(3):255-263. |
| [9] | Rudiger Schwarze;Frank Obermeier;Dieter Janke .Numerical simulation of fluid flow and disperse phase behaviour in continuous casting tundishes[J].Modelling and simulation in materials science and engineering,2001(4):279-287. |
| [10] | Asish Robert;Dipak Mazumdar .Physical and mathematical modelling of flow and residence time distributions in different tundish designs[J].Steel Research,2001(3):97-105. |
| [11] | Chakraborty S;Sahai Y .Effect of Varying Ladle Stream Temperature on the Melt Flow and Heat-Transfer in Contin- uous-Casting TUnishes[J].ISIJ International,1991,31(09):960. |
| [12] | ZHANG Li-feng.Effect of Thermal Buoyancy on Fluid Flow and Inclusion Motion in Tundish without Flow Control Devices--Part Ⅱ: Inclusion Motion[J].钢铁研究学报（英文版）,2005(05):11-17. |
| [13] | ZHANG Li-feng,ZHI Jian-jun,MOU Ji-ning,CUI Jian.Effect of Thermal Buoyancy on Fluid Flow and Inclusion Motion in Tundish without Flow Control Devices--Part Ⅰ: Fluid Flow[J].钢铁研究学报（英文版）,2005(04):20-27. |
| [14] | Morales RD.;Lopez-Ramirez S.;Palafox-Ramos J.;Diaz-Cruz M.;Barreto JD. .Mathematical simulation of the influence of buoyancy forces on the molten steel flow in a continuous casting tundish[J].Modelling and simulation in materials science and engineering,2000(6):781-801. |
| [15] | Launder B E;Spalding D B .The Numerical Computation of Turbulent Flows[J].Computer Methods in Applied Mechan- ics and Engineering,1974,3(02):269. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%